The time is finally here where iPhone 3G or iPhone 3GS users who upgraded to the special iPad 06.15.00 baseband can downgrade back to a regular iPhone baseband. You see, MuscleNerd has released an updated version of RedSn0w that supports downgrading your iPhone from the 06.15.00 baseband to the 05.13.04 baseband. This will finally fix the GPS issues caused by the special iPad baseband, and will allow iPhone 3G/iPhone 3GS users to restore to stock IPSW’s. As such, in this how to guide you will learn how to downgrade your iPhone 3G or iPhone 3GS from the 06.15.00 baseband to the 05.13.04 baseband with the Mac OS X version of RedSn0w 0.9.14b1.
How To Downgrade 06.15.00 Baseband
Step 1) Download RedSn0w 0.9.14b1 for the Mac OS X operating system using the download mirror below or through the iJailbreak Downloads Section.
Step 2) Once you have downloaded RedSn0w 0.9.14b1 you will need to launch it by double clicking on the redsn0w app.
Step 3) With RedSn0w 0.9.14b1 up and running you will need to click the Extras button. You will now see a few buttons presented to you. The button you are interested in is the Select IPSW button. Click this now and select your whatever firmware your iPhone is currently running.
Note: You can find out what firmware your iPhone is running by launching the Settings.app, going into the General tab, followed by the About tab and looking at the Version label.
Step 4) Upon selecting the iOS firmware click the back button, and then shutdown (“slide to power off”) your iPhone. Once you iPhone has shutdown you can proceed to clicking the Jailbreak button.
Step 5) After clicking the Jailbreak button RedSn0w 0.9.14b1 will begin processing in step 3.
When the firmware has been processed you will come to a screen with a few options for your Jailbreak. Obviously you will want to ensure the Downgrade from iPad baseband is selected, and also keep in mind that if you are already Jailbroken you will want to deselect the Install Cydia option.
Once all your options have been selected you will need to click the Next button and you will come to a screen where you will need to put your iPhone into DFU mode. Read through and follow the instructions presented to you which is to plug in and power off your iPhone and click the next button.
Step 6) When you click the next button you will need to follow the instructions presented to you to put your iPhone into DFU mode.
- Hold down Power (corner) button for 5 seconds.
- Without releasing the Power button, also hold down the Home (bottom center) button along with the Power button for 10 seconds.
- Without releasing the home button, stop holding down the power button for up to 15 seconds.
Step 7) After you successfully enter DFU mode RedSn0w 0.9.14b1 will begin the baseband downgrading process. DO NOT interrupt or use the computer during this time. It is important to keep in mind that when your iPhone gets to the “Flashing Baseband” step it will sit there for up to 10 minutes with no feedback. Again DO NOT interrupt or disconnect your iPhone, especially during this step. When the iPhone is finished being downgraded it will reboot into a functional and jailbroken state.
You have just downgraded your iPhone 3G or iPhone 3GS from the 06.15.00 To 05.13.04 baseband. The next step to unlocking your iPhone on the 05.13.04 is simply installing the latest version of UltraSn0w from Cydia. For more tutorials visit the How To Jailbreak Section. Leave any questions in the comments section.
Note: If you are encountering crashes or ‘no signal’ after installing UltraSn0w, you can click here to follow a how to guide to fix this problem for good.